<template>
  <div>
     <!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
           <!-- 选择商品分类的级联选择框 v-model:选中项绑定值-->
          <el-cascader
            v-model="selectdCateKeys"
            :options="cateList"
            :props= cateProps
            @change="handleChange"
            size="small">
          </el-cascader>  
        </el-col>
      </el-row>
      <!-- tab页签区域 v-model:绑定值，选中选项卡的 name-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="idBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag type="warning" v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleColse(index,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="danger" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="success" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" size="mini" :disabled="idBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag type="warning" v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleColse(index,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="danger" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="success" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加动态参数或静态属性的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
     <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data(){
    return {
      // 商品分类列表
      cateList:[],
      // 级联选择框的配置对象,value表示绑定那个属性，label表示显示的名称
      cateProps:{
        expandTrigger: 'hover',
        value:'cat_id',
        label:'cat_name',
        children:'children'
      },
      // 级联选择框双向绑定到的数组
      selectdCateKeys:[],
      // 被激活的页签的名称
      activeName:'many',
      // 动态参数的数据
      manyTableData:[],
      // 静态属性的数据
      onlyTableData:[],
      // 控制添加对话框的显示与隐藏
      addDialogVisible:false,
      // 添加参数的表单数据
      addForm:{
        attr_name:''
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          {required: true, message:'请输入参数名称', trigger: 'blur'}
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible:false,
      // 修改的表单数据对象
      editForm:{},
      // 修改表单的验证规则对象
      editFormRules:{
        attr_name:[
          {required: true, message:'请输入参数名称', trigger: 'blur'}
        ]
      },
      // 控制按钮与文本框的控制形式
      inputVisible:false,
      // 文本框中输入的内容
      inputValue:''
    }
  },
  created(){
    // 获取所有的商品分类列表
    this.getCateList()
  },
  methods:{
    // 获取分类的列表数据
    async getCateList(){
      const {data:res}=await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.cateList = res.data
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange(){
      this.getParamsData()
      
    },
    // tab页签点击事件的处理函数
    // 回调参数 被选中的标签 tab 实例
    handleTabClick(){
      this.getParamsData()
      
    },
    // 获取参数的列表数据
    async getParamsData(){
       // 证明选中的不是三级分类
      if(this.selectdCateKeys.length !== 3){
        this.selectdCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`,{
        params:{sel:this.activeName}
        })
        
      if(res.meta.status !== 200){
        return this.$message.error(res.meta.msg)
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ?item.attr_vals.split(' '):[]
        //控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      });
      if(this.activeName === 'many'){
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed(){
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid=>{
        if (!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id){
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
        params:{
          attr_sel:this.activeName
        }
      })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.editForm = res.data
      this.editDialogVisible=true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return 
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName
        })
        if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.editDialogVisible = false
        this.getParamsData()
      })
      
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err )
        // 用户取消删除操作
      if(confirmResult !== 'confirm'){
        return this.$message.info('取消删除操作')
      }
      // 删除的业务逻辑
      const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if(res.meta.status !== 200){
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
      this.getParamsData()
    },
    // 文本框失去焦点，或按下enter就会触发
    async handleInputConfirm(row){
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return 这输入的内容需要后期处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //需要发起请求，保持这一次操作 
      this.saveAttrValue(row)
    },
    //将对 attr_vals 的操作到数据库
    async saveAttrValue(row){
      //attr_name：分类参数名称 attr_sel：表示是静态属性还是动态参数
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
    },
    // 点击按钮，展示文本输入框
    showInput(row){
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数可选项
    handleColse(index,row){
      row.attr_vals.splice(index,1)
      this.saveAttrValue(row)
    }
  },
  computed:{
    // 如果按钮需要被禁用，则返回true，否则返回false
    idBtnDisable(){
      return this.selectdCateKeys.length !==3 ? true:false
    },
    // 当前选中的三级分类的id
    cateId(){
      if (this.selectdCateKeys.length === 3 ) {
        return this.selectdCateKeys[2]
      }else {
        return null
      }
    },
    // 动态计算标题的文本
    titleText(){
      if(this.activeName === 'many'){
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>